When using a single 1200va transformer would it be best to parallel the outputs on the inrush control? At the moment I only have 4 resistors populated but I noticed max 600va recommended on each output.
Too expensive...
Have found the Panasonic/Levear VP7723D to be a very good replacement for the AP.🙂
Unfortunately today also unobtanium. Have got my VP7723D for about 1.9kEUR
BR, Toni
All these are very expensive, all will be a dream... for ever🙁Too expensive...
Have found the Panasonic/Levear VP7723D to be a very good replacement for the AP.🙂
Unfortunately today also unobtanium. Have got my VP7723D for about 1.9kEUR
BR, Toni
Cross for IPS/VAS PCB heatsinks
Toni asked me to share -- there are direct crosses for the Fischerelektronik heatsinks (and also available from Digikey):
https://www.digikey.com/products/en?keywords=V5229W
https://www.digikey.com/products/en?keywords=V5229X
https://www.digikey.com/products/en?keywords=V5229Y
https://www.digikey.com/products/en?keywords=V5220W
https://www.digikey.com/products/en?keywords=V5220X
For whatever reason, Digikey doesn't currently seem to list the 5220Y, but if they did, the URL would be:
https://www.digikey.com/products/en?keywords=V5220Y
(FWIW, I called them to ask if they could start carry the 5220Y...they were very non-committal about it, but said they'd 'look into it')
Toni asked me to share -- there are direct crosses for the Fischerelektronik heatsinks (and also available from Digikey):
Code:
Fischerelektronik part Assmann part
[COLOR=#000000]SK75/25 STS TO220 [/COLOR][COLOR=#000000][COLOR=#000000]V5229W (L: 25mm / 12kW TR)[/COLOR][/COLOR]
[COLOR=#000000][COLOR=#000000]SK75/37 STS TO220 [/COLOR][/COLOR][COLOR=#000000][COLOR=#000000][COLOR=#000000]V5229X (L: 37.5mm / 10kW TR)[/COLOR][/COLOR][/COLOR]
[COLOR=#000000][COLOR=#000000][COLOR=#000000]SK75/50 STS TO220 [/COLOR][/COLOR][/COLOR]V5229Y (L: 50mm / 8.5kW TR)
[COLOR=#000000][COLOR=#000000][COLOR=#000000]SK76/25 STS TO220 [/COLOR][/COLOR][/COLOR][COLOR=#000000][COLOR=#000000][COLOR=#000000]V5220W (L: 25mm / 10kW TR)[/COLOR][/COLOR][/COLOR]
[COLOR=#000000][COLOR=#000000][COLOR=#000000]SK76/37 STS TO220 [/COLOR][/COLOR][/COLOR][COLOR=#000000][COLOR=#000000][COLOR=#000000]V5220X (L: 37.5mm / 8kw TR)[/COLOR][/COLOR][/COLOR]
[COLOR=#000000][COLOR=#000000][COLOR=#000000]SK76/50 STS TO220 [/COLOR][/COLOR][/COLOR][COLOR=#000000][COLOR=#000000][COLOR=#000000]V5220Y (L: 50mm / 7kw TR)[/COLOR][/COLOR][/COLOR]https://www.digikey.com/products/en?keywords=V5229W
https://www.digikey.com/products/en?keywords=V5229X
https://www.digikey.com/products/en?keywords=V5229Y
https://www.digikey.com/products/en?keywords=V5220W
https://www.digikey.com/products/en?keywords=V5220X
For whatever reason, Digikey doesn't currently seem to list the 5220Y, but if they did, the URL would be:
https://www.digikey.com/products/en?keywords=V5220Y
(FWIW, I called them to ask if they could start carry the 5220Y...they were very non-committal about it, but said they'd 'look into it')
cwz01: Welcome to the SA2014 builder community!
Many thx for the links!
Those small heatsinks are hard to get parts outside europe! I like the form factor of those heatsinks and I use them nearly in every of my designs...
BR, Toni
Many thx for the links!
Those small heatsinks are hard to get parts outside europe! I like the form factor of those heatsinks and I use them nearly in every of my designs...
BR, Toni
Nice rack!
Was the post to show everyone or are you really ready for new projects?
I have a few ideas I would like to toss around, see if they stand up to independent examination.
It worked well last time, I had one little recommendation and you did almost all the work😉
I have some theory worked out that looks pretty nice, and the start of simulations to attempt to implement it.
Also almost finished my own machine-works rebuilt so almost ready for new projects myself.
Best wishes
David
Really ready!
The renewed measurement PC is now powered by opensuse leap 15 and latest GPIB bus drivers 4.1.0
As a warm up I just have designed an ac mains dc blocker small enough that it can be installed in the amp. 80x60 and 35mm height.
The next days the cabling of the 4 channel Ixys powered amp will start...
BR, Toni
The renewed measurement PC is now powered by opensuse leap 15 and latest GPIB bus drivers 4.1.0
As a warm up I just have designed an ac mains dc blocker small enough that it can be installed in the amp. 80x60 and 35mm height.
The next days the cabling of the 4 channel Ixys powered amp will start...
BR, Toni
AC mains DC Blocker
attached schematics and gerber files.
Feel free to use for non commercial DIY projects.
WARNING: this circuit carries AC mains voltage and is therefore very dangerous and can be lethal. I am not responsible for any costs, damage and/or injury using these schematics. Do not use this schematics if you do not have the necessary experience and knowledge!
BR, Toni
attached schematics and gerber files.
Feel free to use for non commercial DIY projects.
WARNING: this circuit carries AC mains voltage and is therefore very dangerous and can be lethal. I am not responsible for any costs, damage and/or injury using these schematics. Do not use this schematics if you do not have the necessary experience and knowledge!
BR, Toni
Attachments
2 diodes in series and antiparallel give a DC blocking voltage of ~ 1,4V.
As you know the AC mains sometimes carry a small amount of DC voltage which move your transformers working point out of the optimal zone and make the transformer physically hum. Especially if the transformer is a toroid with high output power which has a low input resistance on primary side. Typically all 300VA and bigger transformers are affected.
The lytics are acting like very low resistance for the 50/60Hz AC voltage so the AC voltage itself will not be reduced.
BR, Toni
As you know the AC mains sometimes carry a small amount of DC voltage which move your transformers working point out of the optimal zone and make the transformer physically hum. Especially if the transformer is a toroid with high output power which has a low input resistance on primary side. Typically all 300VA and bigger transformers are affected.
The lytics are acting like very low resistance for the 50/60Hz AC voltage so the AC voltage itself will not be reduced.
BR, Toni
You mean, all DC voltage below 1.4V is blocked by diodes, AC voltage goes thru caps and above 1.4V thru diodes. Right?
I would not trust it. If it burns in an electrical device, then there.
I would not trust it. If it burns in an electrical device, then there.
Burn with 70A diodes which withstand easily 700A peak? Even with dry lytics there is nothing to get hot enough to burn...
I have already seen power switch, they were completely melted (small power devices). Don't ask me why. I couldn't explain that either.
AC mains DC Blocker
Here the simulation of the new sa2014 power supply with dc_blocker_small included.
Simulation shows the power supply load of the amplifier providing 400W@4R. The power dissipation in the individual lytics are very small during heavy load: 47mW. Ripple current well between spec.
BR, Toni
Here the simulation of the new sa2014 power supply with dc_blocker_small included.
Simulation shows the power supply load of the amplifier providing 400W@4R. The power dissipation in the individual lytics are very small during heavy load: 47mW. Ripple current well between spec.
BR, Toni
Attachments
R1,2,3 are the toroids DC resistance and R5 is needed for simulator only. Ltspice doesn't like floting grounds.
BR, Toni
BR, Toni